What is SQL INJECTION and how to prevent it?

Question

Ashutosh Kumar Verma · Answer

SQL Injection
SQL Injection is a security vulnerability when an attacker is able to insert or execute malicious SQL queries through input fields or application parameters This can result in unauthorized access or modification of the database, potentially resulting in data corruption , data loss, or system crash.
How SQL injection works
an attacker could insert SQL code into a form field or URL parameter that is not supported by the application or does not clean up properly. This allows the database to execute random commands. For example, a login form with direct user input into a SQL query can be simple.
Exampleand 
and 
SELECT * FROM Users WHERE Username = 'admin' OR '1'='1';
In this example, if the Username field is not properly sanitized, the attacker can use and OR ‘1’ = ‘1’ to bypass authentication and retrieve all records.
and 
Preventing SQL Injection
Use Prepared Statements and Parameterized Queriesand 
These techniques separate SQL code from data input, ensuring that user input is treated as data, not executable code.
Use stored proceduresand 
Place SQL queries in stored procedures to reduce direct user manipulation of variables.
-- Example of a stored procedure in SQL Server
CREATE PROCEDURE GetUser
@Username NVARCHAR(50)
AS
BEGIN
 SELECT * FROM Users WHERE Username = @Username;
END
and 
Escape User Inputsand 
If parameterized queries are not possible, make sure you have properly escaped special characters to neutralize potential threats.
Validate and Sanitize Inputand 
Use rigorous input validation to ensure data conforms to required formats and reject potentially harmful input.
Use ORM (Object-Relational Mapping) Librariesand 
These libraries typically handle custom queries and pull out plain SQL code, reducing the risk of injection
and 
By combining these techniques, you can significantly reduce the risk of SQL injection and protect your database and applications from exploitation.
and 
Also, Read: 
Why is the SQL Wildcard (LIKE) Operator in the query?
and

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What is SQL INJECTION and how to prevent it?

Ashutosh Kumar Verma

1 Answers

SQL Injection

How SQL injection works

Preventing SQL Injection

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